I think lowest is actually Charles. Alex is 2nd worst. Then Beatrix.
Struesdell's got a pretty good ranking though.
I got my Alex with 5* Max Vic, 5* lv85 Lucre, and 300 time elixirs. That's about the same as 1 high-end 5* (Vic) and 3 mid-tier 5*s. Having at least one high-tier 5* (Hiede, Joa, Vic) and Maxed or high lvl 5*s is pretty important.